The prospect of a PSP phone looks even more likely now that we've seen Sony's patent for a touchscreen handheld. The patent describes a device with "digital tactile pixels" that respond to touch and give feedback via vibration. This patent was submitted by Sony Computer Entertainment, the group behind PlayStation, and not Ericsson, like the last alleged PSP phone patent. The mystery device is covered to play games and music and browse the web, but also make phone calls, so what else could it be? [patent via Tech Digest]